I don't understand the reliability issue with the 350. We have 6 flying an average of 500hrs/year and in the last 2 years the total time offline for the fleet was 16 days(including an engine and MO4 repl). The 350B2 and B3 is great for preventative maintenance due to accessibility which, if attended to once/twice in between 100hrs, make the 100 hour (and even the 500hr to an extend) a non event. We have our own engineers and are not bounded to servicings at an specific day booked at an AMO. The flexibility of the EC scheduled maintenance makes it easy to plan maintenance around bad weather days. Solve the possible problem before it becomes a problem basically.
I do think it is unfair to include the B2 in a race against the 407. Although a great aircraft, you can not compare a hydromechanical driven engine with a "FADEC" engine. B3 and B3+ are the 407's competition and it is a credit to the old B2(although they are still producing plenty new once) that she is mentioned in this company with the superior techno engines.